1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 #ifndef SHARE_GC_Z_ZVERIFY_HPP
  25 #define SHARE_GC_Z_ZVERIFY_HPP
  26 
  27 #include "memory/allocation.hpp"
  28 
  29 class ZVerify : public AllStatic {
  30 private:
  31   template <typename RootsIterator>
  32   static void roots_impl();
  33   static void roots(bool verify_weaks);
  34 
  35   static void roots_strong();
  36   static void roots_weak();
  37   static void roots_concurrent();
  38   static void roots_concurrent_weak();
  39 
  40   static void objects(bool verify_weaks);
  41 
  42   static void roots_and_objects(bool visit_weaks);
  43 
  44 public:
  45   // Verify strong (non-concurrent) roots. Should always be good.
  46   static void before_zoperation();
  47 
  48   // Verify all strong roots and references after marking.
  49   static void after_mark();
  50 
  51   // Verify strong and weak roots and references.
  52   static void after_weak_processing();
  53 };
  54 
  55 class VM_ZVerifyOperation : public VM_Operation {
  56 public:
  57   virtual bool needs_inactive_gc_locker() const {
  58     // An inactive GC locker is needed in operations where we change the bad
  59     // mask or move objects. Changing the bad mask will invalidate all oops,
  60     // which makes it conceptually the same thing as moving all objects.
  61     return false;
  62   }
  63 
  64   virtual void doit() {
  65     ZVerify::after_weak_processing();
  66   }
  67 
  68   bool success() const {
  69     return true;
  70   }
  71 
  72   virtual VMOp_Type type() const { return VMOp_ZVerify; }
  73 };
  74 
  75 #endif // SHARE_GC_Z_ZVERIFY_HPP